Restructure DI docs

[gewarren]

• Break out some sections of main overview articles into separate articles.
• Move everything DI-related into a "dependency-injection" folder under "core/extensions".
• Move snippets.

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📄 File	🔗 Preview link
docs/ai/how-to/access-data-in-functions.md	Access data in AI functions
docs/ai/ichatclient.md	Use the IChatClient interface
docs/ai/microsoft-extensions-ai.md	Microsoft.Extensions.AI libraries
docs/architecture/maui/dependency-injection.md	docs/architecture/maui/dependency-injection
docs/azure/sdk/dependency-injection.md	Dependency injection with the Azure SDK for .NET
docs/azure/sdk/thread-safety.md	Thread safety with the Azure SDK for .NET
docs/azure/sdk/unit-testing-mocking.md	Unit testing and mocking with the Azure SDK for .NET
docs/core/compatibility/extensions/10.0/getkeyedservice-anykey.md	Fix issues in GetKeyedService() and GetKeyedServices() with AnyKey
docs/core/extensions/caching.md	docs/core/extensions/caching
docs/core/extensions/configuration.md	Configuration in .NET
docs/core/extensions/custom-configuration-provider.md	Implement a custom configuration provider in .NET
docs/core/extensions/custom-logging-provider.md	Implement a custom logging provider
docs/core/extensions/dependency-injection/basics.md	Quickstart: Dependency injection basics in .NET
docs/core/extensions/dependency-injection/guidelines.md	docs/core/extensions/dependency-injection/guidelines
docs/core/extensions/dependency-injection/usage.md	Tutorial: Use dependency injection in .NET
docs/core/extensions/generic-host.md	[IHostApplicationBuilder](https://review.learn.microsoft.com/en-us/dotnet/core/extensions/generic-host?branch=pr-en-us-51182)
docs/core/extensions/httpclient-factory-keyed-di.md	Keyed DI Support in IHttpClientFactory
docs/core/extensions/httpclient-factory.md	IHttpClientFactory with .NET
docs/core/extensions/localization.md	Localization in .NET
docs/core/extensions/logging.md	Assigns the env var to the value
docs/core/extensions/options-library-authors.md	docs/core/extensions/options-library-authors
docs/core/extensions/options.md	Options pattern in .NET
docs/core/extensions/queue-service.md	Create a Queue Service
docs/core/extensions/scoped-service.md	Use scoped services within a BackgroundService
docs/core/extensions/timer-service.md	docs/core/extensions/timer-service
docs/core/extensions/windows-service.md	Create Windows Service using BackgroundService
docs/core/extensions/workers.md	Worker Services
docs/core/resilience/http-resilience.md	Build resilient HTTP apps: Key development patterns
docs/devops/create-dotnet-github-action.md	Rest of action.yml content removed for readability
docs/fundamentals/toc.yml	docs/fundamentals/toc

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